s = input("")
if "RRR" in s:
    print(3)
elif "RR" in s:
    print(2)
elif "R" in s:
    print(1)
else:
    print(0) s = input("") s input("") input "" if "RRR" in s:
    print(3)
elif "RR" in s:
    print(2)
elif "R" in s:
    print(1)
else:
    print(0) "RRR" in s "RRR" s print(3) print 3 elif "RR" in s:
    print(2) "RR" in s "RR" s print(2) print 2 elif "R" in s:
    print(1) "R" in s "R" s print(1) print 1 print(0) print 0 s = input("") input("") s
s = input("")
if "RRR" in s:
    print(3)
elif "RR" in s:
    print(2)
elif "R" in s:
    print(1)
else:
    print(0)